// https://syzkaller.appspot.com/bug?id=265af1d915f4d6a08eec3ad37e7ee6810e54c34f
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <setjmp.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#include <linux/loop.h>

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif

static unsigned long long procid;

//% This code is derived from puff.{c,h}, found in the zlib development. The
//% original files come with the following copyright notice:

//% Copyright (C) 2002-2013 Mark Adler, all rights reserved
//% version 2.3, 21 Jan 2013
//% This software is provided 'as-is', without any express or implied
//% warranty.  In no event will the author be held liable for any damages
//% arising from the use of this software.
//% Permission is granted to anyone to use this software for any purpose,
//% including commercial applications, and to alter it and redistribute it
//% freely, subject to the following restrictions:
//% 1. The origin of this software must not be misrepresented; you must not
//%    claim that you wrote the original software. If you use this software
//%    in a product, an acknowledgment in the product documentation would be
//%    appreciated but is not required.
//% 2. Altered source versions must be plainly marked as such, and must not be
//%    misrepresented as being the original software.
//% 3. This notice may not be removed or altered from any source distribution.
//% Mark Adler    madler@alumni.caltech.edu

//% BEGIN CODE DERIVED FROM puff.{c,h}

#define MAXBITS 15
#define MAXLCODES 286
#define MAXDCODES 30
#define MAXCODES (MAXLCODES + MAXDCODES)
#define FIXLCODES 288

struct puff_state {
  unsigned char* out;
  unsigned long outlen;
  unsigned long outcnt;
  const unsigned char* in;
  unsigned long inlen;
  unsigned long incnt;
  int bitbuf;
  int bitcnt;
  jmp_buf env;
};
static int puff_bits(struct puff_state* s, int need)
{
  long val = s->bitbuf;
  while (s->bitcnt < need) {
    if (s->incnt == s->inlen)
      longjmp(s->env, 1);
    val |= (long)(s->in[s->incnt++]) << s->bitcnt;
    s->bitcnt += 8;
  }
  s->bitbuf = (int)(val >> need);
  s->bitcnt -= need;
  return (int)(val & ((1L << need) - 1));
}
static int puff_stored(struct puff_state* s)
{
  s->bitbuf = 0;
  s->bitcnt = 0;
  if (s->incnt + 4 > s->inlen)
    return 2;
  unsigned len = s->in[s->incnt++];
  len |= s->in[s->incnt++] << 8;
  if (s->in[s->incnt++] != (~len & 0xff) ||
      s->in[s->incnt++] != ((~len >> 8) & 0xff))
    return -2;
  if (s->incnt + len > s->inlen)
    return 2;
  if (s->outcnt + len > s->outlen)
    return 1;
  for (; len--; s->outcnt++, s->incnt++) {
    if (s->in[s->incnt])
      s->out[s->outcnt] = s->in[s->incnt];
  }
  return 0;
}
struct puff_huffman {
  short* count;
  short* symbol;
};
static int puff_decode(struct puff_state* s, const struct puff_huffman* h)
{
  int first = 0;
  int index = 0;
  int bitbuf = s->bitbuf;
  int left = s->bitcnt;
  int code = first = index = 0;
  int len = 1;
  short* next = h->count + 1;
  while (1) {
    while (left--) {
      code |= bitbuf & 1;
      bitbuf >>= 1;
      int count = *next++;
      if (code - count < first) {
        s->bitbuf = bitbuf;
        s->bitcnt = (s->bitcnt - len) & 7;
        return h->symbol[index + (code - first)];
      }
      index += count;
      first += count;
      first <<= 1;
      code <<= 1;
      len++;
    }
    left = (MAXBITS + 1) - len;
    if (left == 0)
      break;
    if (s->incnt == s->inlen)
      longjmp(s->env, 1);
    bitbuf = s->in[s->incnt++];
    if (left > 8)
      left = 8;
  }
  return -10;
}
static int puff_construct(struct puff_huffman* h, const short* length, int n)
{
  int len;
  for (len = 0; len <= MAXBITS; len++)
    h->count[len] = 0;
  int symbol;
  for (symbol = 0; symbol < n; symbol++)
    (h->count[length[symbol]])++;
  if (h->count[0] == n)
    return 0;
  int left = 1;
  for (len = 1; len <= MAXBITS; len++) {
    left <<= 1;
    left -= h->count[len];
    if (left < 0)
      return left;
  }
  short offs[MAXBITS + 1];
  offs[1] = 0;
  for (len = 1; len < MAXBITS; len++)
    offs[len + 1] = offs[len] + h->count[len];
  for (symbol = 0; symbol < n; symbol++)
    if (length[symbol] != 0)
      h->symbol[offs[length[symbol]]++] = symbol;
  return left;
}
static int puff_codes(struct puff_state* s, const struct puff_huffman* lencode,
                      const struct puff_huffman* distcode)
{
  static const short lens[29] = {3,  4,  5,  6,   7,   8,   9,   10,  11, 13,
                                 15, 17, 19, 23,  27,  31,  35,  43,  51, 59,
                                 67, 83, 99, 115, 131, 163, 195, 227, 258};
  static const short lext[29] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2,
                                 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0};
  static const short dists[30] = {
      1,    2,    3,    4,    5,    7,    9,    13,    17,    25,
      33,   49,   65,   97,   129,  193,  257,  385,   513,   769,
      1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577};
  static const short dext[30] = {0, 0, 0,  0,  1,  1,  2,  2,  3,  3,
                                 4, 4, 5,  5,  6,  6,  7,  7,  8,  8,
                                 9, 9, 10, 10, 11, 11, 12, 12, 13, 13};
  int symbol;
  do {
    symbol = puff_decode(s, lencode);
    if (symbol < 0)
      return symbol;
    if (symbol < 256) {
      if (s->outcnt == s->outlen)
        return 1;
      if (symbol)
        s->out[s->outcnt] = symbol;
      s->outcnt++;
    } else if (symbol > 256) {
      symbol -= 257;
      if (symbol >= 29)
        return -10;
      int len = lens[symbol] + puff_bits(s, lext[symbol]);
      symbol = puff_decode(s, distcode);
      if (symbol < 0)
        return symbol;
      unsigned dist = dists[symbol] + puff_bits(s, dext[symbol]);
      if (dist > s->outcnt)
        return -11;
      if (s->outcnt + len > s->outlen)
        return 1;
      while (len--) {
        if (dist <= s->outcnt && s->out[s->outcnt - dist])
          s->out[s->outcnt] = s->out[s->outcnt - dist];
        s->outcnt++;
      }
    }
  } while (symbol != 256);
  return 0;
}
static int puff_fixed(struct puff_state* s)
{
  static int virgin = 1;
  static short lencnt[MAXBITS + 1], lensym[FIXLCODES];
  static short distcnt[MAXBITS + 1], distsym[MAXDCODES];
  static struct puff_huffman lencode, distcode;
  if (virgin) {
    lencode.count = lencnt;
    lencode.symbol = lensym;
    distcode.count = distcnt;
    distcode.symbol = distsym;
    short lengths[FIXLCODES];
    int symbol;
    for (symbol = 0; symbol < 144; symbol++)
      lengths[symbol] = 8;
    for (; symbol < 256; symbol++)
      lengths[symbol] = 9;
    for (; symbol < 280; symbol++)
      lengths[symbol] = 7;
    for (; symbol < FIXLCODES; symbol++)
      lengths[symbol] = 8;
    puff_construct(&lencode, lengths, FIXLCODES);
    for (symbol = 0; symbol < MAXDCODES; symbol++)
      lengths[symbol] = 5;
    puff_construct(&distcode, lengths, MAXDCODES);
    virgin = 0;
  }
  return puff_codes(s, &lencode, &distcode);
}
static int puff_dynamic(struct puff_state* s)
{
  static const short order[19] = {16, 17, 18, 0, 8,  7, 9,  6, 10, 5,
                                  11, 4,  12, 3, 13, 2, 14, 1, 15};
  int nlen = puff_bits(s, 5) + 257;
  int ndist = puff_bits(s, 5) + 1;
  int ncode = puff_bits(s, 4) + 4;
  if (nlen > MAXLCODES || ndist > MAXDCODES)
    return -3;
  short lengths[MAXCODES];
  int index;
  for (index = 0; index < ncode; index++)
    lengths[order[index]] = puff_bits(s, 3);
  for (; index < 19; index++)
    lengths[order[index]] = 0;
  short lencnt[MAXBITS + 1], lensym[MAXLCODES];
  struct puff_huffman lencode = {lencnt, lensym};
  int err = puff_construct(&lencode, lengths, 19);
  if (err != 0)
    return -4;
  index = 0;
  while (index < nlen + ndist) {
    int symbol;
    int len;
    symbol = puff_decode(s, &lencode);
    if (symbol < 0)
      return symbol;
    if (symbol < 16)
      lengths[index++] = symbol;
    else {
      len = 0;
      if (symbol == 16) {
        if (index == 0)
          return -5;
        len = lengths[index - 1];
        symbol = 3 + puff_bits(s, 2);
      } else if (symbol == 17)
        symbol = 3 + puff_bits(s, 3);
      else
        symbol = 11 + puff_bits(s, 7);
      if (index + symbol > nlen + ndist)
        return -6;
      while (symbol--)
        lengths[index++] = len;
    }
  }
  if (lengths[256] == 0)
    return -9;
  err = puff_construct(&lencode, lengths, nlen);
  if (err && (err < 0 || nlen != lencode.count[0] + lencode.count[1]))
    return -7;
  short distcnt[MAXBITS + 1], distsym[MAXDCODES];
  struct puff_huffman distcode = {distcnt, distsym};
  err = puff_construct(&distcode, lengths + nlen, ndist);
  if (err && (err < 0 || ndist != distcode.count[0] + distcode.count[1]))
    return -8;
  return puff_codes(s, &lencode, &distcode);
}
static int puff(unsigned char* dest, unsigned long* destlen,
                const unsigned char* source, unsigned long sourcelen)
{
  struct puff_state s = {
      .out = dest,
      .outlen = *destlen,
      .outcnt = 0,
      .in = source,
      .inlen = sourcelen,
      .incnt = 0,
      .bitbuf = 0,
      .bitcnt = 0,
  };
  int err;
  if (setjmp(s.env) != 0)
    err = 2;
  else {
    int last;
    do {
      last = puff_bits(&s, 1);
      int type = puff_bits(&s, 2);
      err = type == 0 ? puff_stored(&s)
                      : (type == 1 ? puff_fixed(&s)
                                   : (type == 2 ? puff_dynamic(&s) : -1));
      if (err != 0)
        break;
    } while (!last);
  }
  *destlen = s.outcnt;
  return err;
}

//% END CODE DERIVED FROM puff.{c,h}

#define ZLIB_HEADER_WIDTH 2

static int puff_zlib_to_file(const unsigned char* source,
                             unsigned long sourcelen, int dest_fd)
{
  if (sourcelen < ZLIB_HEADER_WIDTH) {
    errno = EMSGSIZE;
    return -1;
  }
  source += ZLIB_HEADER_WIDTH;
  sourcelen -= ZLIB_HEADER_WIDTH;
  const unsigned long max_destlen = 132 << 20;
  void* ret = mmap(0, max_destlen, PROT_WRITE | PROT_READ,
                   MAP_PRIVATE | MAP_ANON, -1, 0);
  if (ret == MAP_FAILED)
    return -1;
  unsigned char* dest = (unsigned char*)ret;
  unsigned long destlen = max_destlen;
  int err = puff(dest, &destlen, source, sourcelen);
  if (err) {
    munmap(dest, max_destlen);
    errno = -err;
    return -1;
  }
  if (write(dest_fd, dest, destlen) != (ssize_t)destlen) {
    munmap(dest, max_destlen);
    return -1;
  }
  return munmap(dest, destlen);
}

static int setup_loop_device(unsigned char* data, unsigned long size,
                             const char* loopname, int* loopfd_p)
{
  int err = 0, loopfd = -1;
  int memfd = syscall(__NR_memfd_create, "syzkaller", 0);
  if (memfd == -1) {
    err = errno;
    goto error;
  }
  if (puff_zlib_to_file(data, size, memfd)) {
    err = errno;
    goto error_close_memfd;
  }
  loopfd = open(loopname, O_RDWR);
  if (loopfd == -1) {
    err = errno;
    goto error_close_memfd;
  }
  if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
    if (errno != EBUSY) {
      err = errno;
      goto error_close_loop;
    }
    ioctl(loopfd, LOOP_CLR_FD, 0);
    usleep(1000);
    if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
      err = errno;
      goto error_close_loop;
    }
  }
  close(memfd);
  *loopfd_p = loopfd;
  return 0;

error_close_loop:
  close(loopfd);
error_close_memfd:
  close(memfd);
error:
  errno = err;
  return -1;
}

static long syz_mount_image(volatile long fsarg, volatile long dir,
                            volatile long flags, volatile long optsarg,
                            volatile long change_dir,
                            volatile unsigned long size, volatile long image)
{
  unsigned char* data = (unsigned char*)image;
  int res = -1, err = 0, loopfd = -1, need_loop_device = !!size;
  char* mount_opts = (char*)optsarg;
  char* target = (char*)dir;
  char* fs = (char*)fsarg;
  char* source = NULL;
  char loopname[64];
  if (need_loop_device) {
    memset(loopname, 0, sizeof(loopname));
    snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid);
    if (setup_loop_device(data, size, loopname, &loopfd) == -1)
      return -1;
    source = loopname;
  }
  mkdir(target, 0777);
  char opts[256];
  memset(opts, 0, sizeof(opts));
  if (strlen(mount_opts) > (sizeof(opts) - 32)) {
  }
  strncpy(opts, mount_opts, sizeof(opts) - 32);
  if (strcmp(fs, "iso9660") == 0) {
    flags |= MS_RDONLY;
  } else if (strncmp(fs, "ext", 3) == 0) {
    if (strstr(opts, "errors=panic") || strstr(opts, "errors=remount-ro") == 0)
      strcat(opts, ",errors=continue");
  } else if (strcmp(fs, "xfs") == 0) {
    strcat(opts, ",nouuid");
  }
  res = mount(source, target, fs, flags, opts);
  if (res == -1) {
    err = errno;
    goto error_clear_loop;
  }
  res = open(target, O_RDONLY | O_DIRECTORY);
  if (res == -1) {
    err = errno;
    goto error_clear_loop;
  }
  if (change_dir) {
    res = chdir(target);
    if (res == -1) {
      err = errno;
    }
  }

error_clear_loop:
  if (need_loop_device) {
    ioctl(loopfd, LOOP_CLR_FD, 0);
    close(loopfd);
  }
  errno = err;
  return res;
}

int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);

  memcpy((void*)0x20000040, "hfs\000", 4);
  memcpy((void*)0x20000280, "./file1\000", 8);
  memcpy((void*)0x20000080, "iocharset", 9);
  *(uint8_t*)0x20000089 = 0x3d;
  memcpy((void*)0x2000008a, "cp775", 5);
  *(uint8_t*)0x2000008f = 0x2c;
  memcpy((void*)0x20000090, "file_umask", 10);
  *(uint8_t*)0x2000009a = 0x3d;
  sprintf((char*)0x2000009b, "%023llo", (long long)0x1fbc);
  *(uint8_t*)0x200000b2 = 0x2c;
  *(uint8_t*)0x200000b3 = 0;
  memcpy(
      (void*)0x20000580,
      "\x78\x9c\xec\xdd\xcf\x6a\x13\x51\x14\xc7\xf1\xdf\x9d\xa4\x26\xda\x52\xa7"
      "\x7f\xa4\xe0\xb2\x5a\x70\x25\x6d\x5d\x28\x6e\x04\xc9\x43\xb8\x10\x51\x9b"
      "\x08\xc5\x50\x41\x5b\x50\x57\xe2\x5a\x7c\x00\xf7\xee\x5c\x8b\xcf\xe0\x4a"
      "\x7c\x01\x5d\xb9\xf2\x01\xb2\x1b\xb9\x67\xa6\xc9\x34\xc9\x64\x52\x35\xb9"
      "\x6d\xf3\xfd\x40\x86\x69\xe6\x9e\x99\x73\x3b\x77\x32\xf7\x04\xc2\x08\xc0"
      "\xcc\xba\xdb\xf8\xf1\xf1\xc6\x2f\xff\xea\xbe\x75\x5b\x8a\x24\xd5\xa5\xaa"
      "\xa4\x4b\x5a\xab\x1f\xec\xed\xef\xee\xb7\x5b\xcd\x51\x3b\xaa\x58\x84\x7f"
      "\x39\xa5\x91\x6e\xa0\xcd\xce\x5e\x6b\x58\xa8\x8f\xb3\x88\x4c\xec\xff\xaa"
      "\x6a\x21\xff\x1e\x26\x23\x49\x92\xe4\x67\xe8\x24\x10\x9c\xb3\x2b\x78\x50"
      "\x24\xd5\xb2\xab\xd3\xb6\xd7\xa7\x9e\xd9\x64\xbc\x09\x9d\x40\x60\xae\xa3"
      "\x8e\x5e\x6a\x31\x74\x1e\x00\x80\xb0\xb2\xfb\x7f\x94\xdd\xe7\x17\xb2\xf9"
      "\x7b\x14\x49\x1b\xd9\x6d\xff\x4c\xdd\xff\x3b\xa1\x13\x08\x2c\x77\xff\xb7"
      "\x2a\x2b\x71\xfe\xfc\x5e\xb4\x4d\xbd\x7a\xcf\x4a\x38\xbf\x3d\x1a\xa8\x12"
      "\x8f\xe1\x9c\xd2\x91\x75\x64\x82\xe9\xca\xaa\x4a\xcb\x25\x3a\xff\x64\xb7"
      "\xdd\xba\xbe\xf3\xac\xdd\x8c\xf4\x56\x77\x32\xb9\x66\xab\xb6\x6c\xa6\x43"
      "\xf7\x90\x65\x9b\x14\x66\xbb\x3e\xa4\x36\x1d\xe1\xef\xfb\x3e\x6f\x7d\x98"
      "\xf3\x7d\xd8\x2e\xc8\x7f\xc5\x96\x37\x0f\xfe\xd3\x11\xcb\xb9\xaf\xee\x9b"
      "\x7b\xe0\x62\x7d\x50\xb3\x3b\xff\xab\x26\xce\x9f\x26\x3b\x53\x71\xdf\x99"
      "\x4a\xf3\xdf\x2c\xde\xa3\xf5\x32\x4e\x5b\x15\xf4\x72\xc9\x0e\x72\x39\x3b"
      "\x82\xbe\x7c\x52\x79\x2f\xeb\xc3\x2b\x12\x1d\x8e\xa8\x25\x1d\xfd\x82\x20"
      "\x2e\xcb\xd3\xa2\x96\xfb\xa2\xd2\xde\x6d\x95\x44\xad\x0c\x8d\xda\x2e\x89"
      "\x5a\xed\x8f\xea\x8e\xe6\x80\x1f\xa3\xee\xbd\xbb\xe7\xd6\xf5\x5b\x9f\xd5"
      "\xc8\xcd\xff\x23\xff\xdf\xde\xd0\x38\x57\xa6\x6f\x63\x2d\xb3\x91\xe1\xaf"
      "\xce\xc2\x96\x55\x6b\x19\x8f\x91\x58\x74\xac\x6e\xe0\xdf\xbc\xd3\x63\xdd"
      "\xd2\xe2\x8b\x57\xaf\x9f\x3e\x6a\xb7\x5b\xcf\x59\x99\xf9\x95\xb9\x6c\x68"
      "\x9c\x94\x7c\x58\x19\xb1\x52\x51\x4d\x13\x3d\x44\xe0\xcf\x27\x4c\x45\xef"
      "\xa4\x6b\xed\x7e\xe8\x64\x10\x82\x9f\x77\xb9\xb4\xfe\xcb\xd5\x2b\x9b\x56"
      "\x22\xf9\x45\x3c\x62\x9e\x9e\xf8\x45\x6d\xc4\xce\x73\x7b\xdc\x2a\xa8\x0d"
      "\x96\x6d\x79\x61\x48\x05\x57\x5c\x1b\xcc\x17\x57\x70\xe3\xd6\x5c\x57\xae"
      "\x49\x57\xc7\x3f\x62\x9c\xe5\x79\x46\xb8\x86\xbe\xeb\x21\xdf\xff\x03\x00"
      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x9c\x36\xd3\xf8\xc5"
      "\x42\xe8\x3e\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
      "\x00\x00\x70\xda\xf5\x9e\xff\x6b\x4f\x00\xab\xf0\xfc\x5f\x60\x76\xfc\x09"
      "\x00\x00\xff\xff\x65\x88\x7f\x68",
      602);
  syz_mount_image(0x20000040, 0x20000280, 0x321c4d8, 0x20000080, 4, 0x25a,
                  0x20000580);
  memcpy((void*)0x20000100,
         "\x2a\x3c\x61\xe3\xad\xb4\x44\xed\x37\xb6\x0d\x58\xc0\x98\xe5\x0e\xcf"
         "\x35\xb0\x25\xcb\xf2\xcb\x9d\x2d\x81\xdf\xdb\x88\xaa\xe0\xb6\x87\xd1"
         "\xc4\xd3\xa0\x7d\xa7\x5b\x6d\xc7\x3c\xcc\x0b\xa5\x8a\x97\x43\x08\xf5"
         "\x6b\xdf\x0a\x41\xf9\xfd\x08\xf0\x48\x83\xdc\x5f\xf8\x82\x0c\x04\x80"
         "\xdc\x1a\x05\xbc\x37\x90\xe9\xb6\x92\x54\x04\xa9\x83\xf3\xd7\x58\xd1"
         "\xca\xf0\x71\x21\x4a\xb2\xbc\x12\x47\x3f\x87\x1b\x6e\x71\xba\x10\x9a"
         "\x1a\xe2\xa0\xa7\x5c\x3c\x5f\xa2\xd4\xce\x67\xe8\x6b\x17\x57\x94\xe7"
         "\x64\xcc\xf0\x43\xb2\x76\xfb\xac\x0f\x4a\x6c\x2a\x24\x28\x8d\xbb\x84"
         "\xe6\x3f\x5d\xbb\x40\x13\x6f\x9d\xda\x24\xd9\x4d\xec\xe9\x58\x5d\xf5"
         "\x63\xc3\x6f\xe9\xb6\x7a\xd5\xd8\x36\x81\x18\xbe\xc3\xba\x04\xd2\x49"
         "\x0a\x3d\xe8\x75\x05\x79\xde\x13\x44\xb2\xf0",
         181);
  memcpy((void*)0x200000c0, "./file0\000", 8);
  syscall(__NR_mount, 0x20000100ul, 0x200000c0ul, 0ul, 0x269415ul, 0ul);
  return 0;
}